Xpantastic!

Hi All,
That Rotory Encoader Up/Grade fix sounds really interesting.
Yes, Please post all the gory details. Also please do post any 
Failure / Fix you come across. I am constantly keeping a list of 
Fixes. I compile them and post it from time to time. 
If it's OK with the moderator I'll put it in the database.

- Karl  



--- In xpantastic@yahoogroups.com, "mursupeppe" <petri.alanko@...> wrote:
>
> Hi and thanks for the links.
> 
> I happen to know the deep mud I'm in and so I just recently bought two Xpanders (one beyond repairs, the other should be fine), just to find out whether there's anything worth scavenging. Again, I'll let you know if and what.
> 
> > Up to now, I never had a blown 3374 in my Xpander,- but I´m on the 
> > waitlist for 3374 @vintage planet for years and like many others are.
> > CEM3372 are much easier to find.
> 
> I've heard people tell this about their 3374s, but after cross-checking I really have to admit that one of them is really broken. The other one's outputting triangle wave minor third higher than expected, so I cannot count that as "gone", not yet, at least. Something else could be wrong as well, but we're still doing testing and concentrating on the physical issues.
> 
> > The case:
> > Buying vintage gear @ebay, you always buy "private" and because of being 
> > "vintage" w/ no warranty and no return.
> > You agree on this if you bid !
> 
> It didn't go like that.
> 
> I first asked a few questions very carefully, as I wasn't on the holy pony for the first time. I've owned quite a few analog synths in my past and know what they can be like. Finding a pristine - mint, whatever - thing is about as rare as waking up in Mars. Nag nag, yadda yadda, boo hoo... (cont'd)
> 
> > If someone is doing this, he should be prepared for issues unless it´s 
> > made evident the item is in working condition electronically (!!!).
> 
> (cont'd)...which is what I was _told_, literally: "in 100% working condition". 
> 
> > But there´s no guarantee w/ vintage gear, (tack)-switches and pots will 
> > be without issues or the unit won´t blow up the next time you power it 
> > up after arrival.
> 
> I've got a few analog modulars that are about as moody as a difficult teenager after two beers. I have a faint feeling the behaviour you just described is remotely familiar. I just wouldn't sell any of those as "trouble-free" or "perfectly functioning". :-D
> 
> I'm not too keen on opening the case any more than this. What's my problem shouldn't poison the rest of you, even though I was the cat that brought the carcass in. Sorry for bad feelings, everyone, but I'll keep the lid on from now on. 
> 
> > Refurbishing a Xpander or a Matrix-12 means a big time investment in 
> > search for all the available parts, investing money for the parts and 
> > doing all the work yourself if you have the technical skills and own the 
> > tools necessary.
> 
> Well, I'm relatively good at troubleshooting, the other guys do the dirty work since I'm about as handy as a paralyzed baboon could ever be. I'm pretty confident we'll sort this out with some amount of time. And money. Argh. :-/ 
> 
> The goal is no longer to refurbish, but reconstruct and improve, I'd say. See (x) below.
> 
> > Noone can expect to buy a piece of gear which cost over 10.000.- bucks 
> > in the past for 2.000 - 3.000 $ now and it´s like new,- that´s stupid.
> 
> That wasn't the price I paid, not even close, I happened to pay quite a lot more. Obviously, though, you're talking "in general" and not probably referring to this case, but I'll agree with you completely.
> 
> > The manufacturing of dyno-synths like Matrix-12 and Prophet 10 / T-8 
> > killed small companies like Oberheim and Sequential in the past because 
> > of the costs and the sales.
> 
> I'd say we could blame DX7 and D50 at least partially for that. Them and the evolution of pop taste. 
> 
> > These are the CEM3374, the rotarys and the displays.
> > Also, I´m not sure about the switches and numeric key pad.
> > Actually, I doubt the display replacement of Steve Lenham will appear 
> > near future.
> 
> (x) Newsflash! The keyboard tech replaced every rotary pot with a similar part and all he had to do was reverse the connection as the spare parts weren't identical to originals. The result: they all work now. If anyone needs further info, let me know and I'll ask dirty details. The feel is similar, but a bit quieter. No more "tr.. tr.. rrr... RRRrrr" whilst editing. The bonus: the pots have a switch built-in, so one could override the push buttons under the display as well if wanted and replace them with a nice led thingy or... never mind. :-)
> 
> He was also pretty confident he could replace the displays with an updated part of sorts, but it would lose the "Xpander/Matrix" style. Instead, it would be and LCD (if I remember correctly) and black/white. Again, don't blame me for not asking details before writing.
> 
> (Waiting for a FrankenMatrix to resurrect.)
> 
> > Switches and rotarys as well as displays are 2nd row IMO,- the 
> > workaround is to use bankloader and editing software to use a 
> > electronically working machine in the studio.
> 
> I agree, my approach is because of my personal preferences: I like to "feel" the synth.
> 
> > b.t.w.,- if someone needs processors for Xpander/Matrix-12,- you´ll find 
> > ´em in Matrix-1000s (and eventually Matrix-6,- I´m not sure).
> 
> As far as I know, there are six CEM3396 IC chips inside. I don't remember Xpander using those - is there something I should know?
>